(cos(x))-(cos(2x))=0

Solution for (cos(x))-(cos(2x))=0 equation:

Simplifying
(cos(x)) + -1(cos(2x)) = 0

Multiply cos * x
(cosx) + -1(cos(2x)) = 0
cosx + -1(cos(2x)) = 0

Remove parenthesis around (2x)
cosx + -1(cos * 2x) = 0

Reorder the terms for easier multiplication:
cosx + -1(2cos * x) = 0

Multiply cos * x
cosx + -1(2cosx) = 0

Remove parenthesis around (2cosx)
cosx + -1 * 2cosx = 0

Multiply -1 * 2
cosx + -2cosx = 0

Combine like terms: cosx + -2cosx = -1cosx
-1cosx = 0

Solving
-1cosx = 0

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Divide each side by '-1'.
cosx = 0

Simplifying
cosx = 0

The solution to this equation could not be determined.